Let's be honest here, who here sees cloud drake and says "man we need to prioritize that dragon, it makes a huge amount of difference in the game". Compared to the other dragons, the cloud drake does not give much of a help unless you want to rotate (slightly) faster, not to mention that you lose the buff when you are in combat. What I've been thinking is that cloud drake could use something in addition to the movement speed buff like say tenacity (3%/6%/10%). This would give cloud drake a huge amount of prioritization.
It doesn't have to be tenacity, but I believe something needs to be added.